Excel 2013 - matching entries on two spreadsheets

I have a name, address, city, state and zip spreadsheet "A" with 10,000 entries.
 I have another spreadsheet "B" with 300 names only.
 I would like to take the names on the "B" spreadsheet  and  indicate them on the larger spreadsheet with an "X" in a separate column. (See graphic)

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Also, whenever there is a match on Spreadsheet "A", I would like to have that entry on spreadsheet "B" indicated in BOLD and ITALIC.
How can I do this?
I asked a similar question previously but now I need the indication in spreadsheet "B".
earlier question
brothertruffle880Asked:
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gowflowConnect With a Mentor Commented:
ooops forgot to attach the file
gowflow
IsThere.xlsx
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gowflowCommented:
Put this formulas in worksheet A in Col B2 and drag down till last data.
=IF(ISERROR(MATCH(A2,Sheet2!A:A,0)),"","x")

gowlfow
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Mark BullockConnect With a Mentor QA Engineer IIICommented:
Use Excel's VLOOKUP function. You can do it in both directions, checking if a value in spreadsheet "B" exists in "A" and vice versa.

Excel's in-app help explains it well. Or if you like video instruction, this Microsoft page has a nice video series.
https://support.office.microsoft.com/en-us/article/VLOOKUP-What-it-is-and-when-to-use-it-5984e27b-4f0d-431e-83b1-7ab062c75493?CorrelationId=dfaaa526-291e-4b91-9430-5a1d7ba27aee&ui=en-US&rs=en-US&ad=US

Then you can use conditional formatting.
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